Waveguide slotted array antenna

Patent metadata

Field	Value
Publication number	US-10431902-B2
Application number	US-201815964054-A
Country	US
Kind code	B2
Filing date	Apr 26, 2018
Priority date	Jun 9, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A waveguide slotted array antenna comprises a feed layer and a radiation layer, wherein the feed layer is located below the radiation layer, and the radiation layer comprises a first radiation unit, a second radiation unit, a third radiation unit and a fourth radiation unit which are stacked from bottom to top; the first radiation unit comprises a first flat metal plate and a first radiation array arranged on the first flat metal plate, the second radiation unit comprises a second flat metal plate and a second radiation array arranged on the second flat metal plate, the third radiation unit comprises a third flat metal plate and a third radiation array arranged on the third flat metal plate, and the fourth radiation unit comprises a fourth flat metal plate and a fourth radiation array arranged on the fourth flat metal plate. The waveguide slotted array antenna has the advantages of low sidelobes and low cost while ensuring broad bands and high gains, and can be made small.

First claim

What is claimed is:

1. A waveguide slotted array antenna, comprising:
a feed layer; and
a radiation layer,
wherein the feed layer is located below the radiation layer,
wherein the radiation layer comprises a first radiation unit, a second radiation unit, a third radiation unit and a fourth radiation unit which are stacked from bottom to top,
wherein the first radiation unit comprises a first flat metal plate and a first radiation array arranged on the first flat metal plate,
wherein the first radiation array comprises n 2 radiation cavities which are arranged at intervals, wherein n=2 k , and k is a positive integer which is equal to or greater than two,
wherein the n 2 radiation cavities are rectangular concave cavities formed in the upper surface of the first flat metal plate, and the n 2 radiation cavities are distributed on the first flat metal plate in n rows and n columns,
wherein first matching plates are separately arranged in the middle of the front side wall and the middle of the rear side wall of each radiation cavity, and second matching plates are separately arranged in the middle of the left side wall and the middle of the right side wall of each radiation cavity; with the front side wall direction of each radiation cavity as the length direction and the left side wall direction of each radiation cavity as the width direction, the height of each first matching plate and the height of each second matching plate are equal to that of each radiation cavity; the upper end faces of the first matching plates and the upper end faces of the second matching plates are located on the same plane with the upper end face of the first flat metal plate,
wherein the length of each first matching plate is smaller than one fifth of the length of each radiation cavity, and the width of each first matching plate is smaller than one fifth of the width of each radiation cavity; the length of each second matching plate is smaller than one fifth of the length of each radiation cavity, and the width of each second matching plate is smaller than one third of the width of each radiation cavity,
wherein an input port extending to the lower surface of the first flat metal plate is arranged at the bottom end of each radiation cavity, and the input ports are rectangular ports; the front side wall of each input port is parallel to the front side wall of the corresponding radiation cavity, the left side wall of each input port is parallel to the left side wall of the corresponding radiation cavity, the center of each input port overlaps with the center of the corresponding radiation cavity, the length of each input port is smaller than the distance between the two corresponding second matching plates, and the width of each input port is smaller than the distance between the two corresponding first matching plates,
wherein the second radiation unit comprises a second flat metal plate and a second radiation array arranged on the second flat metal plate,
wherein the second radiation array comprises n 2 first radiation sets which are arranged at intervals, and the n 2 first radiation sets are distributed on the second flat metal plate in n rows and n columns and communicated with the n 2 radiation cavities in a one-to-one correspondence mode,
wherein each first radiation set comprises four first radiation holes which are distributed in two rows and two columns at intervals,
wherein the first radiation holes are rectangular holes extending from the upper surface to the lower surface of the second flat metal plate, the four first radiation holes in the first radiation set are located over the n 2 radiation cavities correspondingly communicated with the four first radiation holes; the front side walls of the two first radiation holes located in the first row are flush with the front side walls of the corresponding n 2 radiation cavities, and the rear side walls of the two first radiation holes located in the second row are flush with the rear side walls of the corresponding n 2 radiation cavities; the left side walls of the two first radiation holes located in the first column are flush with the left side walls of the corresponding n 2 radiation cavities, and the right side walls of the two first radiation holes located in the second column are flush with the right side walls of the corresponding n 2 radiation cavities,
wherein the third radiation unit comprises a third flat metal plate and a third radiation array arranged on the third flat metal plate,
wherein the third radiation array comprises n 2 second radiation sets which are arranged at intervals, and the n 2 second radiation sets are distributed on the third flat metal plate in n rows and n columns and communicated with the n 2 first radiation sets in a one-to-one correspondence mode,
wherein each second radiation set comprises four second radiation holes which are distributed in two rows and two columns at intervals,
wherein the second radiation holes are rectangular holes extending from the upper surface to the lower surface of the third flat metal plate, the four second radiation holes in the second radiation set completely overlap with the four first radiation holes in the first radiation set communicated with the second radiation set in a one-to-one correspondence mode after clockwise rotating by 22.5 degrees around the center,
the fourth radiation unit comprises a fourth flat metal plate and a fourth radiation array arranged on the fourth flat metal plate,
wherein the fourth radiation array comprises n 2 third radiation sets which are arranged at intervals, and the n 2 third radiation sets are distributed on the fourth flat metal plate in n rows and n columns and communicated with the n 2 second radiation sets in a one-to-one correspondence mode,
wherein each third radiation set comprises four third radiation holes which are distributed in two rows and two columns at intervals,
wherein the third radiation holes are rectangular holes extending from the upper surface to the lower surface of the fourth flat metal plate, the four third radiation holes in the third radiation set are communicated with the four second radiation holes in the corresponding second radiation set in a one-to-one correspondence mode, and the center of each third radiation hole overlaps with the center of the second radiation hole communicated with the third radiation hole; each third radiation hole can anticlockwise deflect by 22.5 degrees around the center relative to the corresponding second radiation hole,
wherein the length of each third radiation hole is greater than that of each second radiation hole and smaller than 1.5 times of the length of each second radiation hole, and the width of each third radiation hole is greater than two times of the width of each second radiation hole and smaller than three times of the width of each second radiation hole;
wherein a rectangular metal strip is arranged in each third radiation hole, wherein the left end face of the rectangular metal strip is connected with the left side wall of the third radiation hole, and the right end face of the rectangular metal strip is connected with the right side wall of the third radiation hole; the distance from the front end face of the rectangular metal strip to the front side wall of the third radiation hole is equal to the distance from the rear end face of the rectangular metal strip to the rear side wall of the third radiation hole; the upper end face of the rectangular metal strip is located on the same plane with the upper end face of the fourth flat metal plate,
wherein the height of the rectangular metal strip is smaller than that of the third radiation hole, the width of the rectangular metal strip is smaller than one third of the width of third radiation hole, and the length of the rectangular metal strip is equal to that of the third radiation hole,
wherein the first f

Assignees

• Univ Ningbo

Inventors

• You Qingchun
• Huang Jifu
• Qin Liting
• You Yang

Classifications

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title

• H01Q13/10

  Resonant slot antennas · CPC title

• H01Q21/00 Primary

  Antenna arrays or systems (arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00) · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H01Q1/36

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title